By Marvin K. Simon
A big examine bandwidth-efficient modulations with purposes to present day house programBased on study and effects acquired on the California Institute of Technology's Jet Propulsion Laboratory, this well timed ebook defines, describes, after which delineates the functionality (power and bandwidth) of electronic conversation platforms that contain a wide selection of bandwidth-efficient modulations applicable for the layout and implementation of area communications systems.The writer compares the functionality of those platforms within the presence of a few useful (non-ideal) transmitter and receiver features resembling modulator and part imbalance, imperfect provider synchronization, and transmitter nonlinearity. even supposing the fabric specializes in the deep area purposes constructed on the Jet Propulsion Laboratory, the presentation is satisfactorily wide as to be acceptable to a bunch of different purposes facing RF communications.An very important contribution to the medical literature, Bandwidth-Efficient electronic Modulation with software to Deep area Communications* was once commissioned via the JPL Deep house Communications and Navigation procedure middle of Excellence* highlights many NASA-funded technical contributions bearing on deep area communications platforms* is part of the celebrated Deep house Communications and Navigation SeriesThe Deep area Communications and Navigation sequence is authored by way of scientists and engineers with wide adventure in astronautics, communications, and comparable fields. It lays the basis for innovation within the components of deep house navigation and communications via disseminating cutting-edge wisdom in key applied sciences.
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Additional info for Bandwidth-Efficient Digital Modulation with Application to Deep-Space Communications (Deep-Space Communications and Navigation Series 3)
Aside from intrachannel and interchannel amplitude and phase imbalances, the inclusion of a fully saturated RF ampliﬁer modeled by a bandpass hard limiter in the analytical model causes additional degradation in system performance. The performance of OQPSK on such a nonlinear channel was studied in Ref. 10, using the same modulator imbalance model as previously discussed above. The results are summarized as follows. The transmitter is the same as that illustrated in Fig. 2-3 (with the inclusion of the half-symbol delay in the Q channel as previously discussed), the output of which is now passed through a nonlinear ampliﬁer composed of the cascade of a hard limiter and a bandpass ﬁlter (a bandpass hard limiter ).
It is possible to modify MSK to avoid such a loss by ﬁrst recognizing that the CPM form of modulator in Fig. 2-7 for implementing MSK can be preceded by the cascade of a diﬀerential encoder and a diﬀerential decoder without aﬀecting its output (Fig. 2-13). That is, the cascade of a diﬀerential encoder and a diﬀerential decoder produces unity transmission—input = output. Thus, comparing Fig. 2-13 with Fig. 2-11, we observe that precoding the CPM form of MSK modulator with a diﬀerential decoder, resulting in what is referred to as precoded MSK [1, Chap.
8-22) can be also expressed in terms of the diﬀerentially encoded bits, vn . 8 29b) 38 Chapter 2 αn νn νn −1 Delay Tb νn 1 ν1 ν2 Tb ν3 ν4 ν5 t ν1 −1 ν 2n (b2n ) 1 ν 0 = b0 ν 2 = b2 ν 4 = b4 2Tb t 4Tb −1 ν 2n −1 (a2n −1) 1 ν 3 = a3 Tb 3Tb ν 1 = a1 ν 5 = a5 t 5Tb −1 Fig. 2-10. An example of the equivalence between differentially encoded inputs bits and effective I and Q bits. Redrawn from . 8 30) Constant Envelope Modulations αk 39 MSK or SFSK Frequency Modulator s (t) C (t) cos 2 π fc t νIk Differential Encoder νk αk νk −1 Delay Tb Serial to Parallel Converter s (t) νQk S (t) sin 2 π fc t Fig.